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148 lines
4.2 KiB
148 lines
4.2 KiB
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const Queue = require("./util/Queue");
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const addToSet = (a, b) => {
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const size = a.size;
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for (const item of b) {
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a.add(item);
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}
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return a.size !== size;
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};
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class FlagDependencyExportsPlugin {
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apply(compiler) {
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compiler.hooks.compilation.tap(
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"FlagDependencyExportsPlugin",
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compilation => {
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compilation.hooks.finishModules.tap(
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"FlagDependencyExportsPlugin",
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modules => {
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const dependencies = new Map();
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const queue = new Queue();
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let module;
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let moduleWithExports;
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let moduleProvidedExports;
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let providedExportsAreTemporary;
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const processDependenciesBlock = depBlock => {
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for (const dep of depBlock.dependencies) {
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if (processDependency(dep)) return true;
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}
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for (const variable of depBlock.variables) {
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for (const dep of variable.dependencies) {
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if (processDependency(dep)) return true;
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}
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}
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for (const block of depBlock.blocks) {
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if (processDependenciesBlock(block)) return true;
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}
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return false;
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};
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const processDependency = dep => {
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const exportDesc = dep.getExports && dep.getExports();
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if (!exportDesc) return;
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moduleWithExports = true;
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const exports = exportDesc.exports;
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// break early if it's only in the worst state
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if (module.buildMeta.providedExports === true) {
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return true;
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}
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// break if it should move to the worst state
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if (exports === true) {
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module.buildMeta.providedExports = true;
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notifyDependencies();
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return true;
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}
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// merge in new exports
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if (Array.isArray(exports)) {
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if (addToSet(moduleProvidedExports, exports)) {
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notifyDependencies();
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}
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}
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// store dependencies
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const exportDeps = exportDesc.dependencies;
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if (exportDeps) {
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providedExportsAreTemporary = true;
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for (const exportDependency of exportDeps) {
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// add dependency for this module
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const set = dependencies.get(exportDependency);
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if (set === undefined) {
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dependencies.set(exportDependency, new Set([module]));
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} else {
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set.add(module);
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}
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}
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}
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return false;
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};
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const notifyDependencies = () => {
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const deps = dependencies.get(module);
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if (deps !== undefined) {
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for (const dep of deps) {
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queue.enqueue(dep);
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}
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}
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};
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// Start with all modules without provided exports
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for (const module of modules) {
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if (module.buildInfo.temporaryProvidedExports) {
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// Clear exports when they are temporary
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// and recreate them
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module.buildMeta.providedExports = null;
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queue.enqueue(module);
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} else if (!module.buildMeta.providedExports) {
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queue.enqueue(module);
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}
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}
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while (queue.length > 0) {
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module = queue.dequeue();
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if (module.buildMeta.providedExports !== true) {
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moduleWithExports =
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module.buildMeta && module.buildMeta.exportsType;
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moduleProvidedExports = new Set();
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providedExportsAreTemporary = false;
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processDependenciesBlock(module);
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module.buildInfo.temporaryProvidedExports = providedExportsAreTemporary;
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if (!moduleWithExports) {
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module.buildMeta.providedExports = true;
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notifyDependencies();
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} else if (module.buildMeta.providedExports !== true) {
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module.buildMeta.providedExports = Array.from(
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moduleProvidedExports
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);
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}
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}
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}
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}
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);
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const providedExportsCache = new WeakMap();
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compilation.hooks.rebuildModule.tap(
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"FlagDependencyExportsPlugin",
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module => {
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providedExportsCache.set(module, module.buildMeta.providedExports);
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}
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);
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compilation.hooks.finishRebuildingModule.tap(
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"FlagDependencyExportsPlugin",
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module => {
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module.buildMeta.providedExports = providedExportsCache.get(module);
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}
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);
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}
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);
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}
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}
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module.exports = FlagDependencyExportsPlugin;
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